23505 error duplicate key value violates unique constraint. To avoid it you have to make sure that the check for existence of a table, is done after some common advisory lock is taken: begin; select pg_advisory_xact_lock(12345); Mar 2, 2024 · ADD CONSTRAINT fk_has_permission FOREIGN KEY (has_permission) REFERENCES validvalues (numeric_value); I am trying this code to do this, been getting this error. auto\postgres. Autoincrment become 1 hence PostgresException: 23505: duplicate key value violates unique constraint "PK_country". This seems like an intuitive approach, but relying on this optimistic insert can quickly have a negative performance impact on your database. Jun 25, 2014 · Obviously, from the message, you are trying to insert a value in a column that already exists there. For example, if account_id = 123 is causing the error, run: Learn how to resolve the 'duplicate key value violates unique constraint' error in PostgreSQL. My application is using Npgsql. Causes Inserting a new row with a primary key or unique key value that already exists Updating a row to have a value that conflicts with an existing row Bulk imports where data contains duplicate values for unique columns Jan 6, 2024 · The Problem Duplicate key violations occur in PostgreSQL when an INSERT or UPDATE operation attempts to insert or modify a record that would violate a unique constraint, commonly due to a primary key or unique index. When I am using Dec 24, 2017 · Current value remained 1. Oct 31, 2022 · ERROR: duplicate key value violates unique constraint "pg_class_relname_nsp_index" DETAIL: Key (relname, relnamespace)=(log_id_seq, 2200) already exists. ---> Npgsql. windows-x64\src\backend\access\nbtree\nbtinsert. Jan 18, 2024 · I'm trying to enable my application to be able to use SQL Server or Postgresql. Discover the causes, solutions, and examples to fix this common ERROR: duplicate key violates unique constraint "username" SQL status:23505 I have no idea why I get this error, username is a unique column but I shouldn't give any problems when I update this column. c Line: 570 Routine: _bt_check_unique Fixing table structure to avoid `Error: duplicate key value violates unique constraint` Ask Question Asked 11 years, 6 months ago Modified 3 years, 11 months ago ERROR: duplicate key violates unique constraint "username" SQL status:23505 I have no idea why I get this error, username is a unique column but I shouldn't give any problems when I update this column. . If this is the case, reset the Jan 26, 2025 · Encountering this error in PostgreSQL? duplicate key value violates unique constraint "your_table_pkey" (SQLSTATE 23505) If your table has a primary key column that The unique constraint could be a primary key, unique index, or an explicitly defined unique constraint. SchemaName: public TableName: Grades ConstraintName: PK_Grades File: d:\pginstaller_12. Catching and Mar 16, 2025 · Look for the column with the PRIMARY KEY or UNIQUE constraint. Jun 7, 2021 · It can be seen along with the error message “duplicate key violates unique constraint” Here at Bobcares, we often handle requests from our customers to fix similar PostgreSQL errors as a part of our Server Management Services. Exception data: Severity: ERROR SqlState: 23505 MessageText: duplicate key value violates unique constraint "PK_Grades" Detail: Key ("Id")=(1) already exists. If you have a sequencer on the field (like with a serial column type), it is likely out of sync with the table because you have done an insert and supplied a value (rather than letting the "default" mechanism handle it by getting the nextval from the sequencer). 01. May 2, 2016 · Duplicate key value violates a unique constraint Ask Question Asked 9 years, 4 months ago Modified 9 years, 4 months ago Aug 17, 2016 · See the inner exception for details. Sep 9, 2025 · ERROR: duplicate key violates unique constraint it likely means that the table's sequence has somehow become out of sync, likely because of a mass import process (or something along those lines). PostgreSQL version 8 and EF Core version 8. It’s like finding the rogue droid in a Star Wars movie once you spot it, you’re halfway to victory. PostgresException: 23505: duplicate key value violates unique constraint Below are my entity models: Role and User. Mar 9, 2022 · The “duplicate key violates unique constraint” error notifies the caller that a retry is needed. Step 2: Check for Duplicate Data If you’re inserting data manually, check if the value already exists. Oct 30, 2021 · ERROR: 23505: duplicate key value violates unique constraint "board_cards_pkey" DETAIL: Key (id) = (bf3f21a0 - 71ac - 4f94 - 988f - f63a354979f7) already exists. Jan 30, 2024 · The 23505 error code in PostgreSQL, unique_violation, occurs when an operation, typically an INSERT or UPDATE, violates a unique constraint defined in your database. So when I inserted with application. EntityFrameworkCore. d6oa fqntct csg1i rpvh6nsk 8hzy uwnbj gjevzkk o9qrj wi bbl9s3